RADIO INSULATORS.
A USEFUL HINT. Old and cracked gramophone records (writes “Spark Gap” in this month’s Austalian Journal) can generally he secured for a few pence at most secondhand shops. These make excellent insulating material, and in spite of their apparent brittleness may be easily worked. Pieces can be out out by means of a fairly fine tenon saw, or shapes can be fretsawed out. Holes are )best drilled with a spearpoint drill, but do not use too much pressure; the piece of record must rest on a flat surface during the operation. By placing the pieces in hot water or In an oven It is possible to mould or bend them into any required shape. If necessary the grooves on the record may be removed by sandpaper. When Insulators made from records are In .use they should be kept away from the heat or sun, as they are apt to warp; but if the necessary care Is taken they will prove quite satisfactory for general use, especially for experimental work, in place of the more expensive ebonite.
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Bibliographic details
Waikato Times, Volume 116, Issue 19457, 22 December 1934, Page 23 (Supplement)
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178RADIO INSULATORS. Waikato Times, Volume 116, Issue 19457, 22 December 1934, Page 23 (Supplement)
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